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Alveoli Shorten Diffusion Lungs Prevents Due Air Mucus

In the gaseous exchange system, cartilage keeps airways open, goblet cells secrete mucus to trap particles, ciliated epithelium wafts mucus away, blood vessels maintain concentration gradients, squamous epithelium provides a large surface area and short diffusion path, and elastin aids in inhalation and exhalation.

No sistema de troca gasosa, a cartilagem mantém as vias aéreas abertas, as células caliciformes secretam muco para prender partículas, o epitélio ciliado remove o muco, os vasos sanguíneos mantêm o gradiente de concentração, o epitélio escamoso fornece uma área de superfície grande e um caminho de difusão curto, e a elastina auxilia na inalação e expiração.

Front Describe how the tissues in the gaseous exchange system contribute to the functioning of the lungs (8)
Back Cartilage- In trachea and holds the airways open and prevents them from collapsing and bursting due to air pressure changes.
Goblet cells- secrete mucus to trap bacteria, pollen and dust particulates.
Ciliated epithelium- waft the mucus
Blood vessels- supply oxygen to respiring cells,
surround the alveoli to shorten the diffusion pathway for rapid gas exchange. The good blood supply maintains a concentration gradient for increased rate of diffusion. The capillary walls are thin hence shorten diffusion pathway
Squamous epithelium- Alveolus wall is thin which shorten the diffusion pathway. Due to lots of alveoli in the lungs, it creates a large surface area.
Elastin- stretches during inhalation and prevents alveoli from bursting. Elastin recoils to help force air out of the lungs during expiration.

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